Detects and displays underwater outline, water depth, water temperature, fish size and fish depth to help locate fish habitats and plan your approach. Display brightness is adjustable for easy readability at night or in full sun. Controls include sensitivity, screen brightness, depth range, zoom, depth alarm, fish alarm, fish icon, unit changes (FT/M ℃/℉) and language. Suitable for ice fishing, river fishing, sea fishing, shore fishing, kayaking fishing, and other fishing environments. Use scenario: ice fishing view underice contours and depth to identify hole locations and active fish zones; use depth and fish alarms to stay alert when targets are detected. Use scenario: freshwater or coastal river/shore fishing adjust depth range and sensitivity to track fish in varying currents, use temperature data to select likely structures and feeding zones, enable alarms for timely bites. Use scenario: kayaking or smallboat exploration zoom and readouts help you assess underwater structure and fish depth while moving, with unit and language options for quick, local usage.